引入右正合范畴的概念,并证明了右正合范畴的局部化范畴仍然是右正合范畴.同时证明了两类态射范畴是右正合范畴.
Introduce a new notion of a right exact category, prove that the localization of a right exact category is also a right exact category, and obtain two right exact categories of morphisms.